[Equest-users] Questions about 9.6.2 Additional Interior Lighting Power

[Nick Caton]

Hi Jie!

This is certainly a great forum for general 90.1 questions, though you will reach a broader audience I think with the [bldg-sim] mailing list. [bldg-rate] is a less active list that I've used in the past to reach an audience better suited for more technical interpretations, as well.

Note well: italicized phrases in 90.1 have definitions you can refer to for clarification.


1.       9.6.1.d addresses your concern about exceeding the space-by-space LPD.  "Trade-offs" are permitted for the space-by-space method, permitting some spaces to exceed the prescribed level (with or without additional lighting power per 9.6.2.a) so long as the building total installed lighting power does not exceed the total allowance.  LEED EAp2/EAc1 does not change any of these rules to my understanding.

2.       Yes.  Proposed model should reflect actual design, and Baseline model should reflect prescribed levels, inclusive of additional lighting power credits for applicable spaces.

3.       Interesting question!  Your interpretation is probably defensible, but in my opinion overly conservative.  I would not limit the prescribed additional 1.0W/ft2 (108.W/m2) to a lesser calculated value to match the installed "decorative LPD."  LEED has some extra rules found in the footnotes of the EAp2 modeling spreadsheet along these lines to match exterior non-tradable totals between models, but I haven't encountered any similar restrictions along these lines for interior LPD calculations.


That said, I can't recall using these additional allowances heavily on a submitted LEED project, so perhaps/hopefully someone else can chime in with such experience!

~Nick



[cid:489575314 at 22072009-0ABB]

NICK CATON, P.E.
SENIOR ENGINEER

Smith & Boucher Engineers
25501 west valley parkway, suite 200
olathe, ks 66061
direct 913.344.0036
fax 913.345.0617
www.smithboucher.com

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Jenny Zhang
Sent: Tuesday, January 15, 2013 8:15 PM
To: 'equest-users at lists.onebuilding.org'
Subject: [Equest-users] Questions about 9.6.2 Additional Interior Lighting Power

Dear All equest-users,
I have a question about the interpretation of ASHRAE 90.1-2007 9.6.2.
Though it's not about eQuest, I think I could get useful information here because many of you are familiar with 90.1.

9.6.2 presents that the additional lighting power shall not exceed 10.8W/m2. For example if a lift lobby has a general LPD is 10W/sqm and decorative LPD is 14W/sqm.
The additional LPD is exceed 14W/sqm and whether is complied with LEED EA Pr2 and how to do in the ASHRAE energy models?

Following is my understanding:

1.       Item a.in 9.6.2 states that:  the additional lighting power shall not exceed 10.8 W/sqm, but this is not included in 9.4. A project with additional LPD 14w/sqm could also achieve EA Pr2 & Cr1.

2.       For energy models: 1)baseline: the additional LPD should be 10.8W/sqm in this space while 14W/sqm should be 14W/sqm as design.

3.       For spaces with additional LPD lower than 10.8W/sqm, both the baseline model and proposed model should be with additional LPD the same with design.

Am I correct?
Thanks for your attentions.

Jie Zhang






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